[es6] support AssignmentPattern as LHS in for-in/of loops

src/parsing/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 1029 matching lines @@
   };
 
   class PatternRewriter : private AstVisitor {
    public:
     static void DeclareAndInitializeVariables(
         Block* block, const DeclarationDescriptor* declaration_descriptor,
         const DeclarationParsingResult::Declaration* declaration,
         ZoneList<const AstRawString*>* names, bool* ok);
 
     static void RewriteDestructuringAssignment(
-        Parser* parser, RewritableAssignmentExpression* expr, Scope* Scope,
-        bool* ok);
+        Parser* parser, RewritableAssignmentExpression* expr, Scope* Scope);
+
+    static Expression* RewriteDestructuringAssignment(Parser* parser,

[adamk, 2015/12/10 19:23:33]

This looks fine to me.

+                                                      Assignment* assignment,
+                                                      Scope* scope);
 
     void set_initializer_position(int pos) { initializer_position_ = pos; }
 
    private:
     PatternRewriter() {}
 
 #define DECLARE_VISIT(type) void Visit##type(v8::internal::type* node) override;
     // Visiting functions for AST nodes make this an AstVisitor.
     AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
@@ skipping 75 matching lines @@
   TryStatement* ParseTryStatement(bool* ok);
   DebuggerStatement* ParseDebuggerStatement(bool* ok);
 
   // !%_IsJSReceiver(result = iterator.next()) &&
   //     %ThrowIteratorResultNotAnObject(result)
   Expression* BuildIteratorNextResult(Expression* iterator, Variable* result,
                                       int pos);
 
 
   // Initialize the components of a for-in / for-of statement.
-  void InitializeForEachStatement(ForEachStatement* stmt,
-                                  Expression* each,
-                                  Expression* subject,
-                                  Statement* body);
+  void InitializeForEachStatement(ForEachStatement* stmt, Expression* each,
+                                  Expression* subject, Statement* body,
+                                  bool is_destructuring);
   Statement* DesugarLexicalBindingsInForStatement(
       Scope* inner_scope, bool is_const, ZoneList<const AstRawString*>* names,
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
   void RewriteDoExpression(Expression* expr, bool* ok);
 
   FunctionLiteral* ParseFunctionLiteral(
       const AstRawString* name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
@@ skipping 282 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_